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Which enzyme joins an acetyl group from acetyl-CoA to molecule of oxaloacetate to form citric acid?
a. aconitase
b. fumarase
c. citrate synthase
d. succinyl-CoA synthetase

citrate synthase

When a hydride ion or hydrogen is enzymatically removed from a substrate, it is attached to carrier molecule of:
a. NAD+
b. Coenzyme A
c. FAD
d. Thiamine pyrophosphate (TPP)
e. A and B
f. C and D
g. A and C
h. B and D

A and C

Which of the following processes occurs in the cytosol of the cell?
a. pyruvate decarboxylation
b. b-oxidation
c. glycolysis
d. the Krebs Cycle

glycolysis

The process that represents a final common intersection for multiple pathways of oxidation of fuel molecules is:
a. glycolysis
b. pyruvate decarboxylation
c. the electron transport chain
d. the Krebs Cycle

Which of the following is not a function of nucleotides?
a. form important structural components of cell and connective tissue
b. form components of coenzymes
c. can act as regulators of metabolism and universal currency of energy
d. form the building blocks of nucleic acids

form important structural components of cells and connective tissue

True or False: DNA is in the form of chromosomes most of the time in the nucleus of the cell

A portion of transcribed mRNA that does not contain information coding for a protein and is spliced out of the sequence is called a(n):
a. intron
b. exon
c. codon
d. methyl cap

intron

A portion of tRNA molecule consisting of 3 nucleobases that are matched to the mRNA sequence is known as a(n):
a. codon
b. anticodon
c. sense strand
d. antisense strand

anticodon

Consists of a double-stranded helix with base pairs "zipped" together with hydrogen bond

DNA

Contain the nucleobase Uracil

RNA

Contain deoxyribose

DNA

Is the product of transcription

RNA

Can perform enzymatic activity

RNA

The Central Dogma of Molecular Biology proposed by Francis Crick in 1958 states that the most common flow of information in biological systems is from ______ to_______to________.
a. RNA to DNA to protein
b. protein to RNA to DNA
c. DNA to protein to RNA
d. DNA to RNA to protein

DNA to RNA to protein

What is the function of tRNA?
a. is a "blueprint" to be translated into proteins by ribosomes
b. along with proteins forms the main structure of ribosomes
c. carry an amino acid and an anticodon that matches a codon
d. stores genetic information to be transcribed

What is the function of ceruloplasmin?
a. transform copper
b. stores calcium
c. converts hydrogen peroxide (H2O2) to water and molecular oxygen (O2)
d. transforms into a mesh that clots blood and stops bleeding

transform copper

Which of the following neurotransmitters is a peptide?
a. GABA
b. substance P
c. serotonin
d. dopamine

substance P

Oxidoreductase

catalyzes redox reaction

transferase

moves a functional group from one molecule to another

hydrolase

uses water to break various bonds

lyase

breaks bonds by elimination or substitution

Isomerase

rearranges functional groups within a single molecule

ligase

joins two molecules with covalent bonds

All of the following proteins/ peptides are antioxidants and scavengers of free radicals EXCEPT:
a. glutathione
b. superoxide dismutase
c. catalase
d. pepsin

pepsin

True or False: most enzymes are nonspecific and can operate on many substrates

False

All of the following are fibrous proteins except:
a. collagen
b. elastin
c. albumin
d. keratin

albumin

Which of the following would occur in muscle contraction if there were too little ATP present?
a. myosin could not bind actin
b. the power stroke could not occur
c. the myosin binding site of actin would never become exposed
d. myosin would not release from actin and reorient

myosin would not release from actin and reorient

Which of the following proteins coats the horns of animals?
a. collagen
b. keratin
c. elastin
d. fibrin

All of the following are major structural categories of protein EXCEPT
a. membrane
b. complex
c. fibrous
d. globular

complex

Which of the following is TRUE regarding enzymes?
a. most reactions that occur in living organisms do not require enzymes
b. most enzymes are highly specific for one substrate
c. enzymes are denoted by the suffix "-ose"
d. enzymes raise the activation energy of a reaction

Which of the following transports two ions or molecules in the same direction using passive transport?
a. uniporter
b. symporter
c. antiporter
d. pump

symporter

A stretch receptor ( in the bladder wall, for instance) would have which type of ion channel?
a. mechanically - gated
b. ligand-gated
c. voltage-gated
d. none of the above

mechanically - gated

Which of the following membrane protein transporters uses active transport?
a. a sodium channel
b. a glucose carrier protein
c. a sodium-potassium pump
d. a uniporter

a sodium-potassium pump

True or False: proteins can be both messengers and receptors

True

Which statement is False regarding enzyme inhibition?
a. a competitive inhibitor blocks the substance from the active site
b. some enzymes can be inhibited by being modified ( phosphorylated, for example)
c. many pharmaceutical drugs are enzyme inhibitors
d. the presents of an inhibitor increases enzymatic activity